We’ve reached peak jukebox musical with this latest glossy Broadway import, which crams almost 60 popular hits into its two-and-a-half-hour running time, at the expense, unsurprisingly, of satisfying drama. Not that the latter is high on the list of priorities of co-producer Berry Gordy, the Motown mogul whose scattershot, hagiographic book is based on his own rosy 1994 memoir. This rags-to-riches tale is a strictly feel-good affair, with everything from personal demons to race relations presented as minor bumps on the road to musical glory.